我们用望远镜观察月亮。

We ___observe the moon with a telescope.

科学家在实验室里仔细观察化学反应的过程。

Scientists ___observed the chemical reaction carefully in the lab.

她评论说今天的会议很有效率。

She ___observed that today's meeting was very efficient.

我们必须遵守学校的规章制度。

We must ___observe the school rules and regulations.

我们每年都会庆祝春节，这是中国最重要的传统节日。

We ___observe the Spring Festival every year as it's the most important traditional holiday in China.